The first to use gas (tear gas) was by the french in August 1914 in the form of tear gas grenades (xylyl bromide) against the Germans. however the Chlorine gas was introduced to the trenches by German forces on 22 April 1915, at the start of the Second Battle of Ypres.
Germany was the first country to use poison gas
Ypres, France
Poison Gas Tanks Aeroplanes
Poland
First versions of tanks, machine guns(immobile), poison gases, and gas masks.
Poison gas was first used by the Germans at Second Battle of Ypres during the First World War.
Germany
the Germans :)
Poison gas was first used during this battle
Germany was the first country to use poison gas
Ypres, France
Poison Gas Tanks Aeroplanes
Poland
First versions of tanks, machine guns(immobile), poison gases, and gas masks.
SERBIA
Belgium
Poland